Java Project

The task for this project is: Develop a programming assignment suitable for our class. The topic for the assignment can be one we covered in class, or it can present a feature of Java that we did not cover in class.

So things that we have covered so far are writing classes, some GUI, and array(we just learned this for 2 days so I'm not depend on array too much).

So base on those, can someone give me an idea or two of what I should do for this project.